Dual-action single-key mechanism

Details Dual-action single-key mechanism Dual-action single-key mechanism

H - Electricity

01

H

H01H 13/66 (2006.01) G03B 17/00 (2006.01) H04W 88/02 (2009.01) G06F 3/02 (2006.01)

Patent

CA 2681953

A switch assembly is provided to actuate a pair of switches using a single key cap, e.g. for a camera that utilizes a first switch to activate an image focusing function and a second switch to activate a camera shutter. The switch assembly comprises a first switch and a second switch, wherein the first switch partially or completely surrounds the perimeter of the second switch. The first switch comprises an upper conductive surface and a lower conductive surface that, when in contact, electrically couples two terminals for closing a circuit. The second switch comprises an actuator and a dome switch. When the key cap receives a first downward force, only the first switch becomes activated and a first electric circuit is completed. When the key cap receives a second downward force that is greater than the first force, the dome switch collapses and a second electric circuit is completed.

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